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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd9e311cedfd8d0367c397ac33b5c804d6d08d40a67daa6a5cd050b95816f053' 
  AND token = 'xT7bghVpBlwZqdgLCV5RHLLPHPPo4X6GUyyk4qaQuts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}